<template>
  <div class="add-role">
    <header class="add-header">
      <div class="left">
        <span class="arrow" @click="$router.back()"><i class="el-icon-arrow-left" />返回</span>

        <span>|</span>

        <span>{{ roleId ? '编辑角色' : '添加角色' }}</span>

      </div>

      <div class="right">
        黑马程序员
      </div>

    </header>

    <main class="add-main">
      <div class="step-container">
        <el-steps direction="vertical" :active="active">
          <el-step title="角色信息" />
          <el-step title="权限信息" />
          <el-step title="检查并完成" />
        </el-steps>

      </div>

      <div v-show="active === 1" class="form-container">
        <div class="title">角色信息</div>

        <div class="form">
          <el-form ref="roleForm" class="form-box" :model="roleForm" :rules="roleRules">
            <el-form-item label="角色名称" prop="roleName">
              <el-input v-model="roleForm.roleName" />
            </el-form-item>

            <el-form-item label="角色描述">
              <el-input v-model="roleForm.remark" />
            </el-form-item>
          </el-form>
        </div>

      </div>

      <div v-show="active === 2" class="form-container">
        <div class="title">权限配置</div>

        <template>
          <div class="tree-wrapper">
            <div v-for="item in treeList" :key="item.id" class="tree-item">
              <div class="tree-title">{{ item.title }}</div>
              <el-tree
                ref="tree"
                :data="item.children"
                show-checkbox
                default-expand-all
                node-key="id"
                highlight-current
                :props="{ label: 'title' }"
              />
            </div>
          </div>

        </template>

      </div>

      <div v-show="active === 3" class="form-container">
        <div class="title">检查并完成</div>
        <div class="form">
          <div class="info">
            <div class="form-item">角色名称：{{ roleForm.roleName }}</div>

            <div class="form-item">角色描述：{{ roleForm.remark }}</div>

            <div class="form-item">角色权限：</div>

            <div class="tree-wrapper">
              <div v-for="item in disabledTreeList" :key="item.id" class="tree-item">
                <div class="tree-title">{{ item.title }}</div>
                <el-tree
                  ref="diabledTree"
                  :data="item.children"
                  show-checkbox
                  default-expand-all
                  node-key="id"
                  :highlight-current="false"
                  :props="{ label: 'title' }"
                />
              </div>

            </div>

          </div>
        </div>

      </div>

    </main>

    <footer class="add-footer">
      <div class="btn-container">
        <el-button v-if="active > 1" @click="decStep">上一步</el-button>
        <el-button v-if="active < 3" type="primary" @click="nextStep">下一步</el-button>
        <el-button v-if="active === 3" type="primary" @click="confirmAdd">确认添加</el-button>

      </div>

    </footer>

  </div>

</template>

<script>
import { createRoleUserAPI, getRoleDetailAPI, getTreeListAPI, updateRoleAPI } from '@/api/system'
// 处理禁用函数
export function addDisabled(treeList) {
  treeList.forEach(item => {
    item.disabled = true
    // 递归处理
    if (item.children && item.children.length > 0) {
      addDisabled(item.children)
    }
  })
}

export default {
  data() {
    return {
      active: 1,
      treeList: [], // 权限树形列表
      disabledTreeList: [], // 禁用的权限树形列表
      roleForm: {
        roleName: '',
        remark: '',
        perms: [0]
      },
      roleRules: {
        roleName: [
          { required: true, message: '请输入角色名称', trigger: 'blur' }
        ]
      }
    }
  },
  computed: {
    roleId() {
      return this.$route.query.id
    }
  },
  mounted() {
    if (this.roleId) {
      this.getRoleDetail()
    }
    this.getTreeList()
  },
  methods: {
    // 编辑用户回填数据
    async getRoleDetail() {
      const res = await getRoleDetailAPI(this.roleId)
      const { perms, remark, roleId, roleName } = res.data
      // 回填基础表单
      this.roleForm = { perms, remark, roleId, roleName }
      // 回填权限树形列表
      this.$refs.tree.forEach((tree, index) => {
        tree.setCheckedKeys(this.roleForm.perms[index])
      })
    },
    decStep() {
      if (this.active === 1) return
      this.active--
    },
    // 获取权限树形列表
    async getTreeList() {
      const res = await getTreeListAPI()
      this.treeList = res.data
      this.disabledTreeList = JSON.parse(JSON.stringify(res.data))
      // 处理禁用
      addDisabled(this.disabledTreeList)
    },
    // 权限选择-- 至少选择一项
    nextStep() {
      if (this.active === 3) return
      if (this.active === 1) {
        this.$refs.roleForm.validate(valid => {
          if (valid) {
            this.active++
          }
        })
      } else if (this.active === 2) {
        this.roleForm.perms = []
        this.$refs.tree.forEach(tree => {
          this.roleForm.perms.push(tree.getCheckedKeys())
        })
        // flat()可以将多层(嵌套)数组展开成一层数组
        if (this.roleForm.perms.flat().length === 0) {
          this.$message.error('请至少选择一项权限')
        } else {
          this.active++
          this.$refs.diabledTree.forEach((tree, index) => {
            tree.setCheckedKeys(this.roleForm.perms[index])
          })
        }
      }
    },
    // 确认添加

    async confirmAdd() {
      if (this.roleId) {
        await updateRoleAPI(this.roleForm)
      } else {
        await createRoleUserAPI(this.roleForm)
      }
      this.$message({
        type: 'success',
        message: `${this.roleId ? '编辑' : '添加'}角色成功`
      })
      this.$router.back()
    }
  }

}
</script>

<style scoped lang="scss">
.add-role {
  background-color: #f4f6f8;
  height: 100vh;

  .add-header {
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    height: 64px;
    line-height: 64px;
    font-size: 16px;
    font-weight: bold;
    background-color: #fff;

    .left {
      span {
        margin-right: 4px;
      }

      .arrow {
        cursor: pointer;
      }
    }

    .right {
      text-align: right;
    }
  }

  .add-main {
    position: fixed;
    top: 64px;
    bottom: 88px;
    width: 100%;
    overflow-y: auto;
    background: #f4f6f8;
    padding: 20px 230px;
    display: flex;

    .step-container {
      height: 400px;
      width: 200px;
    }

    .form-container {
      flex: 1;
      background-color: #fff;
      overflow-y: auto;

      .title {
        height: 60px;
        line-height: 60px;
        padding-left: 20px;
      }

      .form {
        margin-bottom: 20px;
        padding: 20px 65px 24px;

        .el-form {
          display: flex;
          flex-wrap: wrap;
        }

        .info {
          font-size: 14px;
          color: #666;

          .form-item {
            margin-bottom: 20px;
          }
        }
      }

      .form-box {
        width: 600px;
        display: flex;
        flex-direction: column;
      }
    }
  }

  .add-footer {
    position: fixed;
    bottom: 0;
    width: 100%;
    padding: 24px 50px;
    color: #000000d9;
    font-size: 14px;
    background: #fff;
    text-align: center;
    z-index: 10001;
  }

  .tree-wrapper {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;

    .tree-item {
      flex: 1;
      padding: 0px 4px;
      text-align: center;

      .tree-title {
        background: #f5f7fa;
        text-align: center;
        padding: 10px 0;
        margin-bottom: 12px;
      }
    }
  }
}
</style>
